package com.chunhe.sojourn.common.utils.base64;

import org.springframework.web.multipart.MultipartFile;

import java.io.*;

public class BASE64DecodedMultipartFile implements MultipartFile {
	private final byte[] imgContent;
    private final String header;

    public BASE64DecodedMultipartFile(byte[] imgContent, String header) {
        this.imgContent = imgContent;
        this.header = header.split(";")[0];
    }

    @Override
    public String getName() {
        return new StringBuilder(Long.toString(System.currentTimeMillis())).append(Math.random())
            .append(header.split("/")[1]).toString();
    }

    @Override
    public String getOriginalFilename() {
        return new StringBuilder(Long.toString(System.currentTimeMillis()))
            .append((int) (Math.random() * 10000))
            .append(".").append(header.split("/")[1]).toString();
    }

    @Override
    public String getContentType() {
        return header.split(":")[1];
    }

    @Override
    public boolean isEmpty() {
        return imgContent == null || imgContent.length == 0;
    }

    @Override
    public long getSize() {
        return imgContent.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return imgContent;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(imgContent);
    }

    @SuppressWarnings("resource")
    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        new FileOutputStream(dest).write(imgContent);
    }
}
